如何获取要下载的文件的MIME类型？ [英] How to get MIME Type of a file to be downloaded?

问题描述

我必须通过点击链接下载列出的文件，因为我使用了下面的脚本，但是当文件被下载时，它不能识别下载文件的扩展名。那么，如何获取要下载的文件的MIME类型？ _请求帮助...

I Have to download the listed file on click of the link, for whic I have used the below scripot, but I when the file gets dowloaded, it cannot idenetify the extension of downloaded file. So, How to get MIME Type of a file to be downloaded? _Please Help...

$filename = $_GET['val'];
         // Fetch the file info.
    $filePath = $_SERVER['DOCUMENT_ROOT'] . "dfms/images/uploads/".$filename;


    if(file_exists($filePath)) {
        echo $fileName = basename($filePath);
        $fileSize = filesize($filePath);

        // Output headers.
        header("Cache-Control: private");
        header("Content-Type: application/octet");
        header("Content-Length: ".$fileSize);
        header("Content-Disposition: attachment; filename=".$fileName);

        // Output file.
        readfile ($filePath);                   
        exit();
    }
    else {
        die('The provided file path is not valid.');
    }

推荐答案

使用finfo_file函数FileInfo扩展名（PHP 5.3中默认启用）。
http://www.php.net/manual/en /function.finfo-file.php

Using the finfo_file function from the FileInfo extension (enabled by default in PHP 5.3). http://www.php.net/manual/en/function.finfo-file.php

从文档中的示例

$finfo = finfo_open(FILEINFO_MIME_TYPE);
echo finfo_file($finfo, $filename);
finfo_close($finfo);

在5.3之前的PHP版本中，可以安装pecl扩展名 http://pecl.php.net/package/Fileinfo

In PHP versions prior to 5.3 the pecl extension can be installed http://pecl.php.net/package/Fileinfo

然而在在这种情况下，它需要magic_open（libmagic）库 http://sourceforge.net/projects/libmagic

However in this case it requires the magic_open (libmagic) library http://sourceforge.net/projects/libmagic

另一种方法是使用不推荐的函数 mime_content_type（$ filename） http://au.php.net/manual/en/function.mime-content-type.php

The alternative is to use the deprecated function mime_content_type($filename) http://au.php.net/manual/en/function.mime-content-type.php

哪个依赖于mime.magic文件

Which relies on the mime.magic file

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